ΔE 13.8, fair: the same colour family, but not a straight swap. Brown is noticeably lighter, more muted than Beret Maroon.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Brown is noticeably lighter, more muted than Beret Maroon.
The same difference applies the other way round: Beret Maroon is noticeably darker, more saturated.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Beret Maroon on the colour wheel See Brown on the colour wheel
All matches: Beret Maroon equivalents · Brown equivalents